RE: perovskite22 Oct 2020 08:17
numpty - Wikipedia hits the nail on the head:-
Perovskite is a calcium titanium oxide mineral composed of calcium titanate. Its name is also applied to the class of compounds which have the same type of crystal structure as CaTiO3, known as the perovskite structure.
The question of course is whether the reference you are referring to is referring to the specific mineral or the class of perovskite structures. In my opinion as someone who worked in the area of superconducting perovskite physics for about 5 years it is 99.625% the latter, as there's hundreds of different materials all with perovskite structures and it would be highly unlikely that it was the specific CaTiO3 material that shows the optimum solar cell properties, and it would be doubly unlikely that we only just found this out when CaTiO3 has been known about for 100+ years as compared with a synthetic 'designer' perovskite that we only just fabricated in the lab yesterday to try and specifically obtain good solar properties.
The easy way to find out is to google 'perovskite solar cell' - again Wikipedia comes up with useful concise information:- The name 'perovskite solar cell' is derived from the ABX3 crystal structure of the absorber materials, which is referred to as perovskite structure and where A and B are cations and X is an anion. A cations with radii between 1.60 Å and 2.50 Å were found to form perovskite structures [10]. The most commonly studied perovskite absorber is methylammonium lead trihalide (CH3NH3PbX3, where X is a halogen ion such as iodide, bromide or chloride) with an optical bandgap between ~1.55 and 2.3 eV depending on halide content. Formamidinium lead trihalide (H2NCHNH2PbX3) has also shown promise, with bandgaps between 1.48 and 2.2 eV.
So it's definitely not the specific Calcium Titanium Oxide compound that they are studying but rather Lead based compounds - but it's not yet a slam dunk as Wikipedia goes on to point out - In contrast to CdTe, hybrid perovskites are very unstable and easily degrade to rather soluble compounds of Pb or Sn with KSP=4.4×10-9, which significantly increases their potential bioavailability[68] and hazard for human health, as confirmed by recent toxicological studies.
Thus I doubt we are suddenly going to see the entire PV solar cell industry packing up their factories and going home, they are going to be going strong for 20 more years+ with the current mainly silicon absorber technology.